{"id":"CVE-2025-62596","aliases":["EUVD-2025-37938","GHSA-vf95-55w6-qmrf"],"status":"published","title":"youki container escape and denial of service due to arbitrary write gadgets and procfs write redirects","description":"Youki is a container runtime written in Rust. In versions 0.5.6 and below, youki’s apparmor handling performs insufficiently strict write-target validation, and when combined with path substitution during pathname resolution, can allow writes to unintended procfs locations. While resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target. This issue is fixed in version 0.5.7.","severity":{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00267,"percentile":0.19012,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-363","CWE-61"],"published":"2025-11-05T18:45:18Z","modified":"2026-10-28T02:30:27Z","fixes":[{"ecosystem":"crates.io","package":"youki","fixed_in":["0.5.7"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"crates.io","package":"youki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.7"}]}]},{"source":"osv","ecosystem":"crates.io","package":"youki","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.5.7"}]}]}],"products":[{"vendor":"youki-dev","product":"youki"}],"references":[{"url":"https://github.com/youki-dev/youki/security/advisories/GHSA-vf95-55w6-qmrf","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://github.com/youki-dev/youki/commit/5886c91073b9be748bd8d5aed49c4a820548030a","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://pkg.go.dev/github.com/cyphar/filepath-securejoin/pathrs-lite/procfs","tags":["x_refsource_MISC","Not Applicable","web"]},{"url":"https://youtu.be/tGseJW_uBB8","tags":["x_refsource_MISC","Not Applicable","web"]},{"url":"https://youtu.be/y1PaBzxwRWQ","tags":["x_refsource_MISC","Not Applicable","web"]},{"url":"https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-62596","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-vf95-55w6-qmrf"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/62xxx/CVE-2025-62596.json","tags":["advisory"]},{"url":"https://github.com/youki-dev/youki","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-62596","title":"youki container escape and denial of service due to arbitrary write gadgets and procfs write redirects","description":"Youki is a container runtime written in Rust. In versions 0.5.6 and below, youki’s apparmor handling performs insufficiently strict write-target validation, and when combined with path substitution during pathname resolution, can allow writes to unintended procfs locations. While resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target. This issue is fixed in version 0.5.7.","status":"published","published":"2025-11-05T23:14:37.167Z","modified":"2025-11-06T16:54:15.942Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"high","assessor":"cna"}],"cwes":["CWE-61","CWE-363"],"updated_at":"2026-11-02T14:32:55.19484Z"}],"euvd":[{"id":"EUVD-2025-37938","description":"Youki is a container runtime written in Rust. In versions 0.5.6 and below, youki’s apparmor handling performs insufficiently strict write-target validation, and when combined with path substitution during pathname resolution, can allow writes to unintended procfs locations. While resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target. This issue is fixed in version 0.5.7.","status":"published","published":"2025-11-05T23:14:37Z","modified":"2025-11-06T16:54:15Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"high"}],"updated_at":"2026-11-02T19:49:20.323605Z"}],"ghsa":[{"id":"GHSA-vf95-55w6-qmrf","title":"youki container escape and denial of service due to arbitrary write gadgets and procfs write redirects","description":"### Impact ###\n\nyouki’s apparmor handling performs insufficiently strict write-target validation, which—combined with path substitution during pathname resolution—can allow writes to unintended procfs locations.\n\n**Weak write-target check**\nyouki only verifies that the destination lies somewhere under procfs. As a result, a write intended for `/proc/self/attr/apparmor/exec` can succeed even if the path has been redirected to `/proc/sys/kernel/hostname`(which is also in procfs).\n\n**Path substitution**\nWhile resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target.\n\nThis is a different project, but the core logic is similar to the CVE in runc. Issues were identified in runc, and verification was also conducted in youki to confirm the problems.\nhttps://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm\n\n### Credits ###\n\nThanks to Li Fubang (@lifubang from acmcoder.com, CIIC) and Tõnis Tiigi (@tonistiigi from Docker) for both independently discovering runc's original vulnerability, as well as Aleksa Sarai (@cyphar from SUSE) for the original research into this class of security issues and solutions.","status":"published","published":"2025-11-05T18:45:18Z","modified":"2025-11-15T02:25:31Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"high"},{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H","level":"critical"}],"cwes":["CWE-61","CWE-363"],"updated_at":"2026-11-02T14:39:08.983925Z"}],"nvd":[{"id":"CVE-2025-62596","description":"Youki is a container runtime written in Rust. In versions 0.5.6 and below, youki’s apparmor handling performs insufficiently strict write-target validation, and when combined with path substitution during pathname resolution, can allow writes to unintended procfs locations. While resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target. This issue is fixed in version 0.5.7.","status":"published","published":"2025-11-06T00:15:37.817Z","modified":"2026-10-19T13:10:00.11Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-61","CWE-363"],"updated_at":"2026-11-02T14:11:42.142547Z"}],"osv":[{"id":"CVE-2025-62596","title":"youki container escape and denial of service due to arbitrary write gadgets and procfs write redirects","description":"Youki is a container runtime written in Rust. In versions 0.5.6 and below, youki’s apparmor handling performs insufficiently strict write-target validation, and when combined with path substitution during pathname resolution, can allow writes to unintended procfs locations. While resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target. This issue is fixed in version 0.5.7.","status":"published","published":"2025-11-05T23:14:37.167Z","modified":"2026-10-28T02:30:27.624508439Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"high"}],"cwes":["CWE-363","CWE-61"],"updated_at":"2026-11-02T15:44:51.851511Z"},{"id":"GHSA-vf95-55w6-qmrf","title":"youki container escape and denial of service due to arbitrary write gadgets and procfs write redirects","description":"### Impact ###\n\nyouki’s apparmor handling performs insufficiently strict write-target validation, which—combined with path substitution during pathname resolution—can allow writes to unintended procfs locations.\n\n**Weak write-target check**\nyouki only verifies that the destination lies somewhere under procfs. As a result, a write intended for `/proc/self/attr/apparmor/exec` can succeed even if the path has been redirected to `/proc/sys/kernel/hostname`(which is also in procfs).\n\n**Path substitution**\nWhile resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target.\n\nThis is a different project, but the core logic is similar to the CVE in runc. Issues were identified in runc, and verification was also conducted in youki to confirm the problems.\nhttps://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm\n\n### Credits ###\n\nThanks to Li Fubang (@lifubang from acmcoder.com, CIIC) and Tõnis Tiigi (@tonistiigi from Docker) for both independently discovering runc's original vulnerability, as well as Aleksa Sarai (@cyphar from SUSE) for the original research into this class of security issues and solutions.","status":"published","published":"2025-11-05T18:45:18Z","modified":"2025-11-15T02:25:28Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H","level":"critical"},{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"high"}],"cwes":["CWE-363","CWE-61"],"updated_at":"2026-11-02T15:46:57.348035Z"}]}}